Description:Data Source: USFS--compiled from data provided by each national forest through their regional offices; Modified by TWS to combine data for the lower 48 states and Alaska into a single dataset.
Data Vintage: August 2004.
Useful Info: The geographic extent of this data is the contiguous 48 states and the Tognass and Chugach national forests in Alaska. Data was compiled at scales ranging from 1:24,000 to 1: 126,720. The data will only be visible when you are zoomed in to at least the fourth zoom level on the zoom slider bar. Once visible, this data can be viewed with reasonable confidence at even the highest zoom level.